卢佩生. 1981. 正压大气中长波的演变[J]. 气象学报, 39(2):141-149, doi:10.11676/qxxb1981.016
正压大气中长波的演变
ON THE EVOLUTION PROCESS OF LONG WAVES IN THE BAROTROPIC ATMOSPHERE
投稿时间:1980-01-28  修订日期:1980-05-10
DOI:10.11676/qxxb1981.016
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卢佩生 中国科学院大气物理研究所 
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中文摘要:
      本文研究正压大气中非均匀气流(特别是非平直基流)上扰动的演变过程,对[1]进行了推广,对迭加于超长波基流之上的长波扰动和迭加于超长波或长波基流之上的中、短波的扰动的演变特性进行了统一的处理.结果表明:当小槽、小脊的波长变长时,其振幅(能量)增大,扰动发展;波长变短时,振幅变小,扰动衰减.当小扰动已经发展成长波的时候,或者当我们一般地研究长波的演变过程的时候,则上述规律更为明显,即长波发展时,波长变长更为明显;长波衰减时,波长变短也更为明显.利用这些结果,可以解释大气中槽、脊发展时总是伴随着扰动加宽,而槽、脊收缩时,波长很快减小.其次,扰动发展与否完全由扰动的结构所决定,其中主要是由扰动轴线的方向及其与基流的相对位置所决定.北半球发展型扰动的轴线是:在急流以北呈东北—西南向,急流南呈西北—东南向;而衰减型的轴线是:急流北呈西北—东南向,急流南呈东北—西南向.这些结论和角动量传送理论结果以及天气实际都是符合的.
英文摘要:
      In this paper the evolution process of disturbances superimpased on a barotropic non-uniform (curvilinear in particular) basic current are investigated.The previous workt[1] is generalized by means of general treatment both for the longwaves superimposed on basic current with ultra-long waves and the medium or short waves superimposed on basic current with long waves.The main results are as follows:when the wavelength of small trough or ridge is enlarged,it's amplitude increases and the disturbance develops.In opposite case,i.e.when the wavelength shortens,its amplitude decreases and the disturbence is damped.As a small and short wave has changed into a long wave,the abovementioned laws become clearer,i.e.the wavelength of developing (damping) longwave increases (decreases) more rapidly.These results might be used to explain some observations of evolution processes of trough and ridge in the real atmosphere.Besides,the evolution of disturbance is determined completely its structure,especially by the direction of its axis and its relative position in the basic current.In northern hemisphere,the axis of the developing disturbance is directed NE-SW-ly to the north of the jet stream,and NW-SE-ly to the south of it;while the axis of the damping disturbance is directed NE-SW-ly to the south of the jet stream and NW-SE-ly north of it.These results are in good agreement with the theory of angular transport as well as synoptic experience.
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